In yet another crazy manifestation of the cannabis stigma, any waste containing THC needs special handling that drives up costs.

source: https://www.greenentrepreneur.com/article/335836

The main rule with cannabis waste is: you can’t just throw it away. The general rule of thumb is anything that has THC or comes into contact with THC has to be ground up and mixed with an aggregate material until it is “unusable and unrecognizable”. This is to prevent any material with THC from being accessed by unauthorized people (think minors, pets...),or from having THC end up in the soil or a water source. For this reason, cannabis waste has to be stored securely and only accessed by authorized personnel.

Cannabis Disposal – on-site solution for cannabis manufacturers with ISS 500 CAN:
https://celitron.com/en/products/pharmaceutical-solution/cannabis-disposal